I'm waiting on new 16s and 315/75/16 duractracs to arrive for my '13 jku 6spd. I know using a procal to set the new shift points is important for an auto trans with bigger tires, but what about for a manual? All that should be off if I don't reprogram is my speedo and the in dash mpg calculator correct? Nothing crucial to the way it will drive? I'll probably buy one anyway, but just wondering if I can let it slide for a bit now.